PA66 injection molding often appear problems and solutions

As a common engineering plastic, PA66 is widely used in various fields, such as automotive, electronics, machinery and so on. However, in the injection molding process, there are often some problems, such as shrinkage, warping, silver, etc. These problems will not only affect the quality of the product, but also increase the production cost. Therefore, this article will introduce PA66 injection molding often appear problems and solutions.

Problem 1: Shrinkage hole

Shrinkage hole is one of the common problems in the injection molding process of PA66, mainly due to the uneven shrinkage of plastics. Shrinkage holes can lead to holes on the surface of the product, affecting the quality and aesthetics of the product.

The solution:

1. Increase the mold temperature to make the plastic flow fully in the mold and reduce the possibility of shrinkage holes.

2. Increase the injection pressure so that the plastic is fully filled in the mold and reduce the uneven contraction.

3. Adjust the injection speed and time to ensure that the plastic is fully cooled in the mold and reduce the possibility of shrinkage holes.

Problem two: warping

Warping is another common problem in the injection molding process of PA66, mainly due to the uneven shrinkage of the plastic. Warping can cause the surface of the product to bend or deform, affecting the quality and beauty of the product.

The solution:

1. Increase the mold temperature to make the plastic flow fully in the mold and reduce the possibility of warping.

2. Increase the injection pressure so that the plastic is fully filled in the mold and reduce the uneven contraction.

3. Adjust the injection speed and time to ensure that the plastic is sufficiently cooled in the mold to reduce the possibility of warping.

Problem three: Silver stripes

Silver is one of the common problems in the injection molding process of PA66, mainly due to the rapid shrinkage of the plastic or excessive injection pressure. Silver will cause cracks or cracks on the surface of the product, affecting the quality and beauty of the product.

The solution:

1. Reduce the injection pressure to reduce the excessive shrinkage of plastics.

2. Reduce the mold temperature so that the plastic is fully cooled in the mold to reduce the possibility of silver stripes.

3. Adjust the injection speed and time to ensure that the plastic flows fully in the mold and reduce the possibility of silver stripes.

The problems often occur in the injection molding process of PA66 mainly include shrinkage, warping and silver grain. In order to solve these problems, we can take measures to adjust the mold temperature, injection pressure, injection speed and time. At the same time, we should also pay attention to the quality of raw materials and the specification of processing technology to avoid other problems.